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/*
* This file is part of AtracDEnc.
*
* AtracDEnc is free software; you can redistribute it and/or
* modify it under the terms of the GNU Lesser General Public
* License as published by the Free Software Foundation; either
* version 2.1 of the License, or (at your option) any later version.
*
* AtracDEnc is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
* Lesser General Public License for more details.
*
* You should have received a copy of the GNU Lesser General Public
* License along with FFmpeg; if not, write to the Free Software
* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
*/
#pragma once
#include <vector>
#include <map>
#include <cstdint>
#include "atrac1.h"
#include "../config.h"
namespace NAtracDEnc {
struct TScaledBlock {
TScaledBlock(uint8_t sfi) : ScaleFactorIndex(sfi) {}
/* const */ uint8_t ScaleFactorIndex = 0;
std::vector<TFloat> Values;
};
class TBlockSize;
template <class TBaseData>
class TScaler : public TBaseData {
std::map<TFloat, uint8_t>ScaleIndex;
public:
TScaler() {
for (int i = 0; i < 64; i++) {
ScaleIndex[TBaseData::ScaleTable[i]] = i;
}
}
TScaledBlock Scale(const TFloat* in, uint16_t len);
std::vector<TScaledBlock> ScaleFrame(const std::vector<TFloat>& specs, const TBlockSize& blockSize);
};
class TBlockSize {
static std::array<int, 4> Parse(NBitStream::TBitStream* stream) {
//ATRAC1 - 3 subbands, ATRAC3 - 4 subbands.
//TODO: rewrite
std::array<int, 4> tmp;
tmp[0] = 2 - stream->Read(2);
tmp[1] = 2 - stream->Read(2);
tmp[2] = 3 - stream->Read(2);
stream->Read(2); //skip unused 2 bits
return tmp;
}
static std::array<int, 4> Create(bool lowShort, bool midShort, bool hiShort) {
std::array<int, 4> tmp;
tmp[0] = lowShort ? 2 : 0;
tmp[1] = midShort ? 2 : 0;
tmp[2] = hiShort ? 3 : 0;
return tmp;
}
public:
TBlockSize(NBitStream::TBitStream* stream)
: LogCount(Parse(stream))
{}
TBlockSize(bool lowShort, bool midShort, bool hiShort)
: LogCount(Create(lowShort, midShort, hiShort))
{}
TBlockSize()
: LogCount({{0, 0, 0, 0}})
{}
const std::array<int, 4> LogCount;
};
} //namespace NAtracDEnc
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